This doesn't happen every time I start my truck, but over the last few days, at least one or twice a day, it will run really really rough and black smoke comes out of the right exhaust and I can smell the gas so I know its running rich. It only runs like this for 5 minutes or so and then levels out. My first though was the fuel pressure regulator, but I pulled the vacuum hose and no fuel sprayed out, plus that would cause both banks to run rich. I don't think its the MAF either or that too would cause both banks to run rich. The only thing I can think is that an injector is getting stuck open and as it runs a bit it stops. How do I check to see if injectors are working correctly? Could it be anything else? Thanks for any help!